Striated Wall Lichen, Parmelia parietina; Jung-Koch-Quentell; 1920s; WC-QB28/2-2...
Striated Wall Lichen, Parmelia parietinaMaker
LithographySubject and Association Description
Parmelia parietina, known as yellow wall lichen, is classified under the kingdom Fungi and Ascomycota phylum. Lichens are composite organism, a symbiotic association between a fungus and a photosynthetic partner such as green algae or cyanobacteria. Thus, lichen is not a single plant. The bottom layer of interwoven fibers form the fungus supports and keeps the algae moist. In return the algae provide nutrients for the fungus by photosynthesis.
Lichens are found growing on trees and bare rock in moist habitats, and extreme environments such as artic tundra and rocky coastlines. They are sensitive to environmental changes, making them useful in the study of air pollution, ozone depletion and metal contamination. Furthermore, yellow wall lichen has been used to make dyes, wax, sugar, starch, and gum. Medicinally, it was successfully used in the 1800s to treat diarrhea and hemorrhaging.
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